Magnetic signal device



Jam 29, 1946- B. HAIGH ET Al.

MAGNETIC SIGNAL DEVICE .Filed May 26. 1944 Patented Jan. 29, 1946 UNITED STATESv PATENT OFFICE MAGNETIC SIGNAL DEVICE Leslie B. Haigh, West Orange,t and Franklin A. Stearn, Westield,.N. J., assig'nors to Federal Telephone & Radio Corporation lAprileation May 26, 1944, Serial N.- 537,519 14- Claims. (01.'179-529) invention relates to signal devices for tele:-A phone and like systems and particularly to such devices of the visual type. l

The present invention contemplates the ernployment of improved features of construction and design adapted y for obtaining substantial economies in the cost of production of the component parts and likewise in the assembling thereof to obtain desirable compactness in the assembly so as to economize in material and space requirements. Itis further designed to have an improved mode of operation and electrical shielding contributing to greater eiciency, reliability and more satisfactoryl operation. My device is further of a materially simplified and durable construction and greatly facilitates assembly ofr the respective parts and proper adjustment thereof resulting in important maintenance economies. l

An important feature vof the present improvements consists of a simplified single piece frame member of an improved channel form for snp-gv porting the parts. This improved channeled frame permits of the closely positioned, or conar tact, mounting of the units upon a supporting panel and provides a full shielding of the magnet coil as the wall of .the channel providesr shielding common to adjacent coils. The frame being part of the magnetic circuit is further made with an integrally formed lip in an arrangement providing a pole piece and in addition a support for a bearing piece for the movable armature. The armature thereof is -furtherarranged and pivotally supported with relation to the frame pole piece and likewise to a central core pole of the magnet so as to provide multiple air gaps as-N sociated with poles at each side of the pivotal point of the armature. As a result, upon energizing the magnet an attractive force is applied to the armature at opposite sides of its pivot in 'a manner greatly increasing thetorsional pull ti'ple assembly of the improved signal devices upv on'a supporting panel; 'Y

Fig. 2 is a view of the combined drop and jack structure in side elevation with the panel and drop shown in section y Fig. 3 is a vertical cross-sectional view taken on line 3=^-3 ofl'Fig. 2;

Fig. 4 is a view corresponding to Fig. 2 with the parts shown in the restored position upon inserting the plug connection.

Fig. 5 lis a cross sectional view taken on line 5-5 of Fig. 2i v ing. 6 is a view in side elevation of the magnet and movable armature incorporated in a sim'- pliffied for"r1'1'o'f target type of line signal.

Fig; 7 is a similar view 'of a `modification for a line signal assembly,

- Inthe preferred embodiment of the invention as shownin Figs. 1 to 5 the improved features are embodied with a combined jack and restoring drop arrangement. Therein the supporting frame and iron of 4the magnet is formed of a single piece of magnetic material comprising ine tegral upper lower and side walls l, 2 and 3 and the turned-over end walls 4 and 5. The frame so formedv provides an open sided,` elongated and rectangular enclosure for the magnet and armature assembly and which in its cross section is of channel formation. With an accompanying arrang ment wherein the coil, jack contacts and associated par-'tsv are'o'f a width and positioned .within the vertical planes defined by the sideedg'es of the fra-Ine, the devices in the panel board assembly are positioned 'side by side with frame to frame ei'igagemerit,A `or near engagement, as illus-J` trated in Fig. 1. It accordingly results with advantage', that a full enclosure shielding of each cil is 'provided wherein the vertical side wall 3 is common in its shielding path tothe adjacent coils. 'here'by'is obtainedeconomy both in space Associated therewith is a -I'natelially improved supporting and operating arrangement for the armature d. In accordance with this feature of the invention, as best shown in Figs. 2, 3 and 4, an iI-itegral 'Supporting lip and pole piece 6 is stamped 'out and bent inwardly from the uppe'i flange and `sidewall portion of the channel frame member. This integral lipl 6. having a free end, may be of a degree f resiliency providing in the rst instance a supporting and clamping member for the bearing piece 'l formed at its inner end with thedown `tui-ned ears 9 and perforated to a is' pivotally mounted or fulcrumed. After proper adustin'ent, the b'e'aring piece 1 may b'e Welded' or riveted permanently in place. As

Shown in the improved arrangement the in-te'gl .f

lip E also operates as a pole piece with relation to the upper surface of the magnet forwardly of its pivotal point and having the normal air gap d thereby to apply a supplemental magnetic pull on the armature in addition to the attraction or pull thereon imparted by the pole piece extension b of the usual centrally positioned magnetic core acting upon the rearward end of the'armature through the air gap e. The armature as shown is provided with the usual forward latch eXtension I provided with the detent I I for'normal Y Vparticularly adapted to the disclosed combined retaining engagement with the usual. hinged drop Y drop rand jack arrangement it will be understood or signal target I2. Y Y In the construction as disclosed the forward end wall 4 of the magnet frame is provided withbe assembled in close or contacting arrangement. In addition to the advantageous mutual sidewall shielding effect as vreferred to a desirable compactness in the assembly is permitted which in comparable relation to the standard units as at present Vemployedv may be of the order of about three to one of the present standard space requirement thus substantially increasing the oper- -ating ycapacity of a panel board 'of'given 'space limitations. Y

While the described structural features are that 'certain features thereofmay with like adthreaded apertures to receive the securing screwsv4 j I4 passed through the countersunk apertures'in a shutter mounting plate 'I 5 and apertures inthe front panel whereby the magnet frame and plate I5 are secured upon the panelmounting. An` additional securing screw, is provided countersunk within an aperture in the panelV and Y threaded to the frame end wall. The member I5 may desirably be of vertical channel form with 'the side flanges apertured at their lower portions to receive the horizontally positioned pivot pin I8 for the drop or shutter I2.

In the assembling of the magnet and associated armature within the frame I, the coil is mounted; upon the usual cenltral core b and provided withy forward and rearward insulated spacer bushings with the usual coilterminal connectors 2| pro-` jected outwardly throughA apertures` in the end` wall. The core is secured as by a screw 23.Y The armature bearing member 1, withthe armature pivotally secured thereon, is then assembled;

through the side opening with its horizontal securingr portion resiliently held and secured by the combined lip and pole piece 6 firmly to retainv the armature in proper relation to the pole pieces b and E. -Y VThis arrangement, as will be understood, permits of horizontal adjustment of the bearing piece 'I and the supported armature for properly adjusting Vthe operating relation,

f. The frame Vmember Iatits underside and at itsrearward portion is formed with a downwardly deflected lip portion 24, (Fig. 5), in similar forv mation to that of the lip portion 6 and providing a resilient securing lip or flange for the attachment of a jack assembly composed of the usual forwardly extending spring contacts assembled with suitableY insulating blocks or spacers.

The jack assembly'indicated generally'by J is connected by an inverted U Vbolt 26 providing at its upper end a loop Vreceived over the securing lip 24, This permits lateral assembly therewith as willbe readily understood after which the jack members Vare rmly secured bythe tightening of the usual clamping nuts 28, In the customary arrangement the upper line contact 29 is provided with an insulating button 30 positioned to engage the forwardly extending restoring spring vantages beincorporated in a simplified target Asignal structureas'emp-loyed in line use indication of fswitch'boards and the like. Such an i embodiment isshown in Fig. 6 wherein a magergized for the raising of the targetwhen the related line is in use. In this structure-44 indicates acontact of the customarily employednight 32 passing through the panel with the upturned `V lip 33 positioned to engage the drop for the restoring thereof to latched position upon being yelevated by the insertion of the usual line connecting Aplug 35 as indicated in Fig. 4.

There is thus produced a simplified structural form of combined dropand jaclrY wherein the parts are assembled with ease, with improved accessibility for adjustment and inspectionand wherein the' parts thereof, including the jackv structure, are of a width and positioned to come within the vertical plane of the sidewalls of the #nhe support I as referred to whereby they may alarm circuit which is grounded by engagement of the targetv 40 therewith.v A'further modifi-v cation is shown in Fig. 7 employing the improved double pole and air gap feature and a fulcrumed armature with a target type signal as employedxfor trunk line signalling, wherein the magnet coils as shown are mounted directly to the under side of the frame enclosure 46 which y at its front portion is provided with the/window 41 and Vwherein the individual frames for the magnets are omitted as not required for shielding in such assemblies. In this instance the forward pole piece 48 secured to the underside of cover plate 46 may be an elongated bar common to a pluralityY of magnets as will beunder- Y stood and the fulcrumA bearing piece 49 may be welded to the cover :plate-46.

What is claimed is: v

1. fri-.magnetically actuated signal device comprisin'g a magnet coil provided with a core, an iron frameenclosure thereforgconsisting of an open sided channel section enclosing member formed in one piece adapted for multiple unit assembling whereby the sidewall of the frame has va common shielding 'relation to adjacent coils.

2. A magnetically actuated signal device comprisingal magnet coil provided with a core, an iron frame enclosure therefor consisting of an integrally formed elongated open sided frame member of channel section formed in one piece adapted for multiple `runitV assembling with the sidewall of thevframe in common4 shielding relation to adjacent coils and a pivoted armature supported in the frame and in cooperative relation to the Vmagnet core and frame.A Y

3. A magnetically actuated signal device Ycomprising. a magnet coil provided with a core, an iron frame enclosure thereforconsisting ofY an open sided frame member of channel section formed in one piece adapted to receivethe coil therein and for multiple Vunit assembling with the sidewall of the frame "in, common shielding relation to adjacent coils, said vframe Lmember extending forwardly ofthe rcoil and having within its forward extension a pivoted'armature` in an extension .forwardly ofv the. coil and formed;v with an inwardlyV deflected pole piece portion prising. a magnet coil provided. with a core, an iron frame support therefor consistingof an' open sided frame member of channel section.

supporting the. coil therein and adapted for multiple unit assembly withthe side wall of the frame in common shielding relation to an adjacent coil, said frame having an extension forwardly of the coil and formed with an inwardly deflected pole piece portion, an armature pivotally supported in said extension in cooperating relation to said pole piece and to the magnet core, and a movable signal element operatively associated with the armature whereby the latter controls the movement thereof.

5. A magnetically actuated signal device comprising a magnet coil provided with a core, an iron frame support for the coil, an armature supported inside the connes of the frame and by an integral part thereof and fulcrumed to have an air gap relative to both the core and the frame for unidirectional movement by magnetic attraction on energizing of the coil and signal means controlled by the armature.

6. A magnetically actuated signal device comprising a coil provided with a core, an iron frame enclosure for the coil of open side channel section, said iron frame having an extension forwardly of the coil, an armature supported inside the confines of the frame and by an integral part thereof and fulcrumed in magnetic air gap relation to both the core and the iron frame for unidirectional movement by magnetic attraction on energizing of the coil and said coil and armature being contained within the frame to permit of multiple assembly of the units with the sidewall .of the frame in mutual shielding relation to an adjacent coil.

7. A combined drop and. jack structure comprising a magnet coil provided with a core, a supporting frame member therefor consisting of an open sided member of channel section adapted for multiple unit assembly with the side wall of the frame in mutual shielding relation to adjacent coils, said frame member extending forwardly of the coil and having within its forward extension a pivoted armature in cooperative relation to the magnet core and to the frame, a panel support to which the frame is secured, a shutter drop pivotally supported at the front of the panel,

a latch extension on the armature forwardly extending through the panel and formed with a detent to engage the drop, said frame being formed on its end side with a vertical deflected lip portion, a jack spring assembly provided on its upper surface with an attached loop for engaging the deflected lip portion said jack being provided with a forwardly extending restoring spring and adapted for restoring engagement with the drop responsive to insertion of a line extension plug.

8. A magnetically actuated signal device comprising a magnet coil provided with a core, an iron frame support therefor, said frame having an extension forwardly of the coil and formed with an inwardly deflected pole piece portion, an armature pivotally supported inside said iron frame support and by an integral part thereof in cooperating relation to said pole piece and to the magnet core, and a movable target element controlled by the armature.

9. A magnetically actuated signal device comprising a magnet coilprovided with a core, an iron frame support therefor, said frame having formed integrally therewith, an armature bearing member supported by the pole piece, an armature4 pivotally supported inside said, iron frame in. the.` bearing member in magnetically coupled relation. to said. pole piece and to the magnet core .and aA signal target controlled by the armature..l

. l0. A magnetically actuated .signal device com-` prising a magnet coilprovided with a core, an iron frame support therefor, said frame having an extension forwardly of the coil and formed with an inwardly deflected pole piece portion, an l armature bearing member slidably secured by the pole piece portion, an armature pivotally supported by the bearing member in magnetically coupled relation to said pole piece and to the magnet core to be rotatably moved thereby by attraction at opposite sides of its fulcrum and a signal target controlled by the armature.

11. Afmagnetically actuated signal device comprising a magnet coil provided with a forwardly.

v netic material, said frame being extended forwardly of the coil and of open side channel section, a pole piece integrally formed on the frame by inward deflection of a portion of the upper wall thereof forward of the` coil, a bearing member secured to the pole piece and formed with bearing ear portions, a pin carried by the ear portions, an armature pivoted on the pin to extend forwardly and rearwardly thereof in magnetic coupled relation to the pole piece and the core at opposite sides of its fulcrum, a latch extension on the armature provided with a detent, a hinged drop engaged by the detent, an integral securing lip formed on the frame under wall and a jack assembly provided with a loop for lateral assembly with the lip and said jack assembly coil and armature members having a width to be nonextending beyond the vertical planes dened by the sides of the frameto permit of multiple close assembling wherein the sidewall of the frame has a mutual shielding relation to adjacent coils.

13. A combined drop and jack structure comprising a magnet coil having a forwardly extended core, a frame support therefor of magnetic material, said frame being extended forwardly of the coil, a pole piece integrally formed on the frame by inward deflection of a portion of the upper wall thereof forward of the coil, a bearing member slidably secured by the pole piece and formed with bearing ear portions positioned in a vertical plane intermediate of the core and frame pole, a pin carried by the ear portions, an armature pivoted on the pin to extend forwardly and rearwardly thereof in magnetic coupled relation to the pole piece and the core at opposite sides of its fulcrum, a latch extension on the armature provided with a detent, a hinged drop engaged by the detent and a jack assembly secured to the frame support.

14. A combined drop and jack structure comprising a magnet coil having a forwardly extended core, a frame support therefor of mag-V 4 Y y netic material, said frame being extended forwardly of the coil, a pole piece integrally. formed on the frame by inward deflection of a portion of the upper wall thereof forward of the coil, ka bearing member slidably secured by the pole piece and formed with bearing ear portions, a pin carried by the ear portions, an armature pivoted onv the pin to extend forwardly and rearwardly thereof in magnetic coupledl relation to the pole piece-and the "core'at opposite sides of its fulcrum, a latch extension on the armature provided With a detent, a hinged drop engaged by the detent, an'integral securing lip formed on the frame under Wall and a jack'assembly provided with a loop vconnector for lateral assembly with the securing lip.

' LESLIE B. HAIGH. Y Y

FRANKLIN A. STEARN. 

